Should you grade Slowpoke #66?

Borderline

+$209.36

net at PSA 10, but the gem rate is 12.1% — profitable only if it gems

The ledger

Raw card$17.50
Regular fee−$79.99
Shipping, both ways−$15.00
Selling fees−$49.62
PSA 10 sale$371.47
Net at PSA 10+$209.36
Net if it grades PSA 9 instead$-78.19

12.1% of the 33 copies PSA has graded came back a 10. Pop gem rates are a ceiling — centering and surface on your copy decide.

Prices from real completed sales, updated daily. Population data from PSA's public population report.